not long ago I’ve discovered the news about ditching the XUL -based Add-ons for FF in favor of WebExtensions. That sounds nice, but I’m afraid, that by looking and the WE possibilities some addon’s won’t be able to convert to WE format.
One I’m using is Hide Caption Titlebar Plus addon, that saves me some vertical space by removing system titlebar.
That is not a problem for Windows users as they already have “tabs on titlebar” feature, bu I would like that feature also available on Linux or at least to have this as an option. i believe a lot of Linux users would to have this feature as well.